#!/usr/bin/env python3
"""
现代 setup.py 命令体系：
egg_info, dist_info, editable_wheel 等新命令如何取代传统的 build 和 install
"""

def confirm_user_understanding():
    """确认用户的正确理解"""
    
    print("✅ 你的理解完全正确！")
    print("=" * 50)
    
    print("""
现代 setup.py 接收的新命令：
✓ egg_info        - 生成传统元数据格式 (.egg-info)
✓ dist_info       - 生成现代元数据格式 (.dist-info) 
✓ editable_wheel  - 创建可编辑安装的 wheel
✓ build_ext       - 只编译 C/C++ 扩展
✓ bdist_wheel     - 创建标准 wheel 包

传统命令 (基本不再使用):
❌ build         - 太宽泛，做太多事情
❌ install       - 直接安装，难以管理
❌ develop       - 被 editable_wheel 取代

你的观察是准确的！这是构建系统现代化的结果。
    """)

def show_command_mapping():
    """展示新旧命令的对应关系"""
    
    print("\n🔄 新旧命令对应关系:")
    print("-" * 35)
    
    mapping = [
        ("传统命令", "现代命令组合", "说明"),
        ("-" * 10, "-" * 15, "-" * 30),
        
        ("python setup.py build", 
         "egg_info + build_ext + ...", 
         "拆分为多个专门化的步骤"),
         
        ("python setup.py install", 
         "bdist_wheel + pip install", 
         "先打包再安装，更安全"),
         
        ("python setup.py develop", 
         "editable_wheel + pip install", 
         "可编辑安装的现代方式"),
         
        ("python setup.py sdist", 
         "仍然使用", 
         "源码分发保持不变"),
    ]
    
    for old, new, desc in mapping:
        print(f"   {old:25} -> {new:25} | {desc}")

def explain_new_commands_detail():
    """详细解释新命令"""
    
    print(f"\n📋 现代命令详解:")
    print("-" * 25)
    
    commands = {
        "egg_info": {
            "目的": "生成包元数据 (.egg-info 格式)",
            "内容": ["PKG-INFO", "requires.txt", "SOURCES.txt", "dependency_links.txt"],
            "何时使用": "构建过程的第一步，收集包信息",
            "你看到的": "✅ 这就是你在日志中看到的命令"
        },
        
        "dist_info": {
            "目的": "生成现代元数据 (.dist-info 格式)",
            "内容": ["METADATA", "WHEEL", "RECORD", "top_level.txt"],
            "何时使用": "创建 wheel 时使用，比 egg_info 更现代",
            "标准": "PEP 427 wheel 格式标准"
        },
        
        "editable_wheel": {
            "目的": "创建可编辑安装的特殊 wheel",
            "特点": "包含 .pth 文件或导入钩子",
            "何时使用": "pip install -e . 时",
            "替代": "取代传统的 python setup.py develop"
        },
        
        "build_ext": {
            "目的": "只编译 C/C++ 扩展模块",
            "调用": "会执行你的 CMakeBuild 类",
            "何时使用": "当检测到 ext_modules 时",
            "专注": "只做编译，不管其他事情"
        },
        
        "bdist_wheel": {
            "目的": "创建标准的 wheel 分发包",
            "输出": ".whl 文件",
            "何时使用": "正式构建和分发",
            "标准": "PEP 427 wheel 格式"
        }
    }
    
    for cmd, info in commands.items():
        print(f"\n🔧 {cmd}:")
        for key, value in info.items():
            if isinstance(value, list):
                print(f"   {key}: {', '.join(value)}")
            else:
                print(f"   {key}: {value}")

def show_pip_install_process():
    """展示 pip install 的完整过程"""
    
    print(f"\n🔄 pip install -e . 的完整调用序列:")
    print("-" * 45)
    
    process = [
        ("1. 元数据发现", "egg_info", "pip 需要知道包名、版本、依赖"),
        ("2. 依赖解析", "(不调用setup.py)", "pip 解析并安装构建依赖"),
        ("3. 准备构建", "egg_info", "再次确认元数据"),
        ("4. 编译扩展", "build_ext", "你的 CMakeBuild 在这里运行"),
        ("5. 创建可编辑wheel", "editable_wheel", "创建特殊的可编辑 wheel"),
        ("6. 安装", "(不调用setup.py)", "pip 安装 wheel 到环境"),
    ]
    
    for step, command, description in process:
        if command == "(不调用setup.py)":
            print(f"   {step:15} | {command:15} | {description}")
        else:
            print(f"   {step:15} | setup.py {command:10} | {description}")
    
    print(f"\n💡 你看到的 'egg_info' 是第1步或第3步！")

def explain_why_change():
    """解释为什么要改变"""
    
    print(f"\n🎯 为什么要从 build/install 改为新命令？")
    print("-" * 45)
    
    reasons = [
        ("精确控制", "每个命令专注单一职责，更容易调试和优化"),
        ("并行支持", "不同步骤可以独立执行，支持缓存和并行"),
        ("标准化", "PEP 517 定义了标准的构建接口"),
        ("安全性", "不直接修改系统，先打包再安装"),
        ("可重现性", "构建过程更可预测和可重现"),
        ("现代需求", "支持虚拟环境、容器化等现代部署方式")
    ]
    
    for reason, explanation in reasons:
        print(f"   ✓ {reason:10}: {explanation}")

def show_your_project_commands():
    """展示你的项目会收到的命令"""
    
    print(f"\n🏗️  你的项目在不同阶段收到的命令:")
    print("-" * 40)
    
    scenarios = [
        ("开发安装", "pip install -e .", [
            "egg_info (元数据收集)",
            "build_ext (编译你的 CMake 扩展)",
            "editable_wheel (创建可编辑安装)"
        ]),
        
        ("正常安装", "pip install .", [
            "egg_info (元数据收集)",
            "build_ext (编译扩展)",
            "bdist_wheel (创建标准 wheel)"
        ]),
        
        ("构建分发", "python -m build", [
            "sdist (源码包)",
            "bdist_wheel (二进制包)"
        ]),
        
        ("只编译", "python setup.py build_ext", [
            "build_ext (直接编译，传统方式)"
        ])
    ]
    
    for scenario, command, steps in scenarios:
        print(f"\n📌 {scenario} ({command}):")
        for step in steps:
            print(f"   - {step}")

def main():
    confirm_user_understanding()
    show_command_mapping()
    explain_new_commands_detail()
    show_pip_install_process()
    explain_why_change()
    show_your_project_commands()
    
    print(f"\n" + "=" * 50)
    print("🎉 总结:")
    print("   ✅ 你完全理解了现代构建系统")
    print("   ✅ egg_info, dist_info, editable_wheel 确实取代了 build/install")
    print("   ✅ 这是 PEP 517 现代化的结果")
    print("   ✅ 你的项目已经适应了这种新方式")
    print("   ✅ 看到 egg_info 是完全正常的现代构建过程")
    print("=" * 50)

if __name__ == "__main__":
    main() 